title: Transcriptional repressor HipB regulates the multiple promoters in Escherichia coli.
abstract: HipB is a DNA-binding protein in Escherichia coli and negatively regulates its own promoter by binding to the palindromic sequences [TATCCN8GGATA (N represents any nucleotides)] on the hipBA promoter. For such sequences, bioinformatic analysis revealed that there are a total of 39 palindromic sequences (TATCCN(x)GGATA: N is any nucleotides and x is the number of nucleotides from 1 to 30) in the promoter regions of 33 genes on the E. coli genome. Notably, eutH and fadH have two and three TATCCN(x)GGATA palindromic sequences located in their promoters, respectively. Another significant finding was that a palindromic sequence was also identified in the promoter region of hipAB locus, known to be involved in the RelA-dependent persister cell formation in bacteria. Here, we demonstrated that HipB binds to the palindromic structures in the eutH, fadH, as well as the relA promoter regions and represses their expressions. We further demonstrated that HipA enhances the repression of the relA promoter activity by HipB. This effect was not observed with D291A HipA mutant which was previously shown to lack an ability to interact with HipB, indicating that HipA enhances the HipB's repressor activity through direct interaction with HipB.
authors.affiliation: Department of Biochemistry, Robert Wood Johnson Medical School and Center for Advanced Biotechnology and Medicine, Piscataway, N.J., USA.
authors.forename: Chun-Yi
authors.initials: CY
authors.lastname: Lin
authors.forename: Naoki
authors.initials: N
authors.lastname: Awano
authors.forename: Hisako
authors.initials: H
authors.lastname: Masuda
authors.forename: Jung-Ho
authors.initials: JH
authors.lastname: Park
authors.forename: Masayori
authors.initials: M
authors.lastname: Inouye
mesh_terms: D004269:DNA, Bacterial / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000378:metabolism*; D024202:Electrophoretic Mobility Shift Assay; D004926:Escherichia coli / Q000235:genetics*; D029968:Escherichia coli Proteins / Q000378:metabolism*; D015964:Gene Expression Regulation, Bacterial; D011401:Promoter Regions, Genetic; D011485:Protein Binding
chemical_list: D004269:DNA, Bacterial; D004268:DNA-Binding Proteins; D029968:Escherichia coli Proteins; C070740:hipB protein, E coli; C070741:hipA protein, E coli